Question

Select the correct answer from the following options.

	List I : Vascular bundles		List II : Arrangement of vascular tissue
A	Radial	1	Scattered in pith
B	Collateral	2	Side by side
C	Medullary	3	Alternate radii
D	Cortical	4	Situated in cortex

• A. A- 3, B- 2, C- 1, D- 4
• B. A- 2, B- 3, C- 1, D- 4
• C. A- 3, B- 2, C- 4, D- 1
• D. A- 3, B- 1, C- 2, D- 4

Answer 1

The correct option is A A- 3, B- 2, C- 1, D- 4

1. Radial bundles - Xylem and phloem are seen as patches and they alternate each other and occupy different radii on the axis separated by non conductive tissue.

2. Collateral bundles - In this type xylem and phloem are arranged side by side on same radii.

3. Medullary bundles - Vascular bundles as in plants of the family Umbelliferae situated in the peripheral part of the pith of a stem, which are scattered and sometimes held to be an extension of a leaf trace.

The cortical bundle is a vascular system, which allows the transportation of water and nutrients through the voluminous cortex. This system is unique to cacti and helps to replace the water lost to the dry desert air. The cortical bundle emerges radially from the xylem and produces shoots that run tangentially to the cortex, branching extensively and vascularizing every part of the cortex.